题目内容
比较大小:
log0.30.7与log2.12.9;
log0.30.7<1<log2.12.9;
(1)log0.27和log0.29;?
(2)log35和log65;?
(3)(lgm) 1.9和(lgm) 2.1(m>1);?
(4)log85和lg4.